Hi Susan. I used to use dishwashing det. in every load. I don't anymore and really haven't noticed much of a difference. I might not pay well enough attention. I really never noticed build up issues though. I do use a bit of Arm & Hammer now in my loads to get rid of the stinks. My pfs especially. Cam'rynn is pooping awful and it doesn't just *plop* out anymore. I'm sorry to hear that Mari has sores

I've tried using Dawn, and it has helped with the stink issues I've had with morning diapers. I haven't found the right amount yet, as I've had to use so many rinses to get it all out. There's a long post on Babycenter's Diapering page about using Dawn exclusively. That mama also uses baking soda and vinegar in her wash routine. I hate having to rinse so many times on a regular basis. I'm back to Simple Green/Washing Soda for now and figure I'll use Dawn periodically when the stinkies flare up.